The Samurox, otherwise known as the King of the Fighter Dragons, was once a powerful ancient dragon from 3000 years ago, and was the leader of the Blue Draconium Empire of that age. Today in Dragon City, it exists as a bone-mark much like other ancient dragons.

The Samurox's true form is never revealed in the show as it was attached to Cyrano, a Green Draconium dragon, during Episode 15: The Rules of Power. Khatah was tricked by Word Paynn into opening a strange blue draconium box, containing inside a crystal draconium map that leads him and later Parmon Sean to the bone-mark. Under the influence of such powerful and pure draconium, the Samurox's bone-mark is later discovered by Parmon who gives it to Cyrano.